Corruption of Champions - This is one of the best single player games I have found that deals with fetishy fun including MC and Hypnosis of all kinds. Definatly one to check out

Permanent Positions - A Story that will occasionally feature hypnosis and other mind conrol, alongside other things, written by Devi

Powermogri's Patreon - Powermogri, otherwise known as Lola, or Miss V, is creating Erotic Art and Fiction about Mind Control and Transformation
Note: Not associated with Hypnodragon.de at the current moment.